I can not open a Job File in pdi 4.1

My pdi-4.1.0 that I was using for months, had today a problem after trying to run a job and now it can not open any job and only show this message:

Unable to load job info from XML node


There was an error while reading the shared objects (continuing load) : {0}


Unexpected problem reading shared objects from XML file : null


Error reading information from input stream
Content is not allowed in prolog.

Can someone help me with this...? Thanks.